21221340122412 has 144 divisors (see below), whose sum is σ = 56298872710080. Its totient is φ = 6727109875200.

The previous prime is 21221340122393. The next prime is 21221340122441. The reversal of 21221340122412 is 21422104312212.

21221340122412 is a `hidden beast` number, since 2 + 1 + 2 + 2 + 13 + 401 + 2 + 241 + 2 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 662550414 + ... + 662582442.

It is an arithmetic number, because the mean of its divisors is an integer number (390964393820).

Almost surely, 2^{21221340122412} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21221340122412, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28149436355040).

21221340122412 is an abundant number, since it is smaller than the sum of its proper divisors (35077532587668).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21221340122412 is a wasteful number, since it uses less digits than its factorization.

21221340122412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36664 (or 36659 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

Adding to 21221340122412 its reverse (21422104312212), we get a palindrome (42643444434624).

The spelling of 21221340122412 in words is "twenty-one trillion, two hundred twenty-one billion, three hundred forty million, one hundred twenty-two thousand, four hundred twelve".